1) Earth’s ozone layer a) has been thickening over the past several years. b) filters harmful ultraviolet radiation from the sun. c) exists only over Antarctica. d) traps carbon dioxide in the stratosphere. 2) The atmosphere is a) the layer in which weather occurs. b) the layer that contains the ozone layer. c) the layer of water in the oceans. d) the layer of gases that surrounds Earth. 3) Increased carbon dioxide may cause global warming by a) allowing more sunlight into the atmosphere. b) reflecting more sunlight from clouds. c) reducing the amount of oxygen in the air. d) trapping more heat in the atmosphere. 4) Scientists predict that banning the use of chlorofluorocarbons will a) have no effect on the ozone layer. b) gradually restore the ozone layer. c) increase ultraviolet light reaching Earth. d) increase the rate of ozone depletion. 5) The two most abundant gases in the atmosphere are a) carbon dioxide and oxygen. b) carbon dioxide and nitrogen. c) nitrogen and oxygen. d) nitrogen and hydrogen. 6) Earth’s atmosphere is important to living things because it a) contains dust and other particles. b) is very thin compared to the size of Earth. c) provides all the gases that living things need to survive. d) maintains a constant relative humidity. 7) Heat from the sun reaches you by a) conduction b) convection c) light emission d) radiation 8) From Earth to space, the main layers in our atmosphere are: a) troposphere, stratosphere, mesosphere, thermosphere. b) stratosphere, troposphere, mesosphere, thermosphere. c) mesosphere, troposphere, stratosphere, thermosphere. d) thermosphere, troposphere, stratosphere, mesosphere. 9) The layer of our atmosphere in which weather occurs is the a) troposphere. b) stratosphere. c) mesosphere. d) exosphere. 10) The ozone layer is found in the a) troposphere. b) stratosphere. c) mesosphere. d) thermosphere. 11) The ozone layer protects living things on Earth from a) visible light. b) infared rays. c) ultraviolet radiation. d) carbon dioxide. 12) Which layer of the atmosphere protects Earth’s surface from being hit by most meteoroids? a) troposphere. b) stratosphere. c) mesosphere. d) thermosphere. 13) The thermosphere divided into two layer called the _____________. a) exosphere and mesosphere b) ionosphere and statosphere c) troposphere and statosphere d) ionosphere and exosphere 14) Rain, snow, sleet, and hail are all examples of _________________. a) freezing rain. b) condensation. c) evaporation. d) precipitation. 15) Water vapor(gas) to a liquid is this step in the water cycle. a) evaporation b) precipitation c) condensation d) convection 16) Carbon dioxide, water vapor and other gases make up ___% of gas in the atmosphere. a) 2% b) 5% c) 1% d) 1.5% 17) The condition of the atmosphere at a particular time and place is the areas _____________. a) climate. b) weather. c) global warming. d) seasons. 18) When climbing a high mountain, you get out of breath easily because a) the volume of air is greater. b) the air is more dense. c) there is less oxygen in each cubic meter of air. d) air pressure is greater. 19) The average, year-after-year conditions of temperature, precipitation, winds, and cloud in an area are known as its a) climate. b) weather. c) global warming. d) seasons. 20) Over the past 200 years, the level of carbon dioxide in the atmosphere has a) decreased slightly. b) increased until recently, and then decreased. c) increased steadily. d) stayed about the same.

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